Automatic electric door control



AUTOMATIC ELECTRIC DQOR CONTROL Filed Feb. 12, 1926 Mae/775K f/erberi 6069 Blodye I? v Patented July 17, 1928.

UNITED sures 1,677,129 PATENT OFFICE.

' HERBERT CADY BLQDG-E'IT, OF KALAMAZOO, MICHIGAN, ASSIGNOR T DOOR CONTROL COMPANY, OF HARTFORD CITY, INDIANA, A CORPORATION OF INDIANA.

AUTOMATIC ELECTRIC "DOOR CONTROL.

Application filed IE'ebruery 12, 1926. Serial No. 87,831.

The object of this invention is to provide an electrically operated mechanism. for the 0 ening and closing oi doors or gates, either 0? the rollin or swinging type, conveniently l placed push uttons or switches enabling the operator to open and close the; doors or gates with e greet saving of time and labor. The use of push buttons or switches is not e part of my invention.

My invention relates to an improvement in door or gate controls, in which the control unit is secured to the door or gate. A. stationary rope or cable, along which the control unit moves, gives the desired movement i for the operation of swing or rolling doors or gates I uttuin this control movement by the mechanism illustrated in the accompanying drswing, in which:

Fig, 1 is a verticol section of the entire device, o sliding door being indicated by hroheu section, v p

wiring diagram of the struc- Ell A ports of the drawing will be identified r numerals, which are the some in both. mews.

1 is the rosin bracket or support providing suitoble base. 2 is on induction electric motor supplying power to the unit, 3 is the motor pinion on the motor shaft. i is the main driving gear meshing with pinion 3. 5 is friction driving pulley which is opposed to the idler lf-grooved pulley 6. The pulleys 5 and 6 embrace the rope or cable 7, the ends of which ere'connected to the door post at each side of the door where they are secured. to brackets 33 by suitable set screws 31. The idler pulley 6 is carried on pivoted arm 8 which is supported on the pivot stud 9 which permits up and down movement. The pulley 6 is journalcd on the stud 10 and is disposed in opposition to the pulley 5 carried by the gear A spring 11 compresses arm E and is adjusted by the adjusting screw 12 which regulates the ressure between the h pulleys 5 end 6. y adjusting the screw 1?; pressure is applied to these friction pulleys causing them to engage the rope or cable 2 1 3, 13 are fair leading tubes or guides secured to the main bracket 1 for guiding the structures upon the cable 7 when the complete unit is moving along said rope till contact 18 is between the carbonbrushes 19,

or cable. The cable 7 being supported by its ends on the door-posts or frame and being disposed near the path of the door in its to and fro opening movement, is engaged frlctionully by the pulleys 5 and 6 which are advanced alon the cable and thus open or close the door y carrying the unit which is attached thereto back and forth. The pulleys of course -engage the rope or cable by friction and yield sufficiently to permit the some to revolve in the event the switch fails to out out the motor, and will yield for instance it there should be a person or vehicle in the path of the door when it is closing, or opening either, for that matter. I

14 is a cutout switch body. 15 is the sliding switch rod of non-conducting material which is adapted to reciprocate in and project outwardly at either end of the cut-out switch body id. The switch rod 15 is provided with retaining disks 16, 16 for the purpose of engagement ofthe compression coil springs 1'5 1? for imparting movement to the said rod The rod 15 cooperates with the adjustable stop 32 which is screw threaded into the bracket 33, above referred to. 12% is o metal band of conducting material. th rod 15 constituting a switch member. is blush with the surface of rod 15 so it will readily reciprocate through the switch. Carbon brushes 19, 19 are on opposide sides of the switch and located with an easy moving tit at right angles to the switch rod 15. The inner ends of the carbon brushes 19: are concave and conformed to the contour oi the rod 15. This provides for a large contsct surface for conducting the electric current when the switch is closed. When the switch rod 15 is in central position the thus forming an electrical contact for the passage oi current. When the switch rod 15 is forced to the position shown in the drawing, the metal. band 18 is out of contact with the carbon brushes, thus disconnecting the electric current. Flat springs 20, held in position by the retaining screws 21, hold the carbon brushes 19 yieldingly in place. 21 are binding screws which serve to attach the power lea s 22 so that the current from the source of supply is properly conducted through the fiat spring 20 to and from the carbon brushes 19.

23 is e, reverse switch body which is made 25, it is verv versed,

29, 29 are the power leads which are our of non-conducting material. The reversing mechanism is to properly conduct the current from the source of supply to the field windings and rotating armature of the motor 2, so that the desired direction of rotu- 7 tion of the motor will be obtained. 24: is the switch rod of non-conducting materiel which reciprocates in the reverse switch bed 23, 25, 25s are metal bands oi? contact con noting materiel erreuged iii the form of stationary rings upon the switch rod 2%. These rings are let in flush with the rod 2 k so that the same may reciprocate readily through the switch body The projecting ends of the rod 24 contact with the adjustable stops in the bracket 33 at each end and are consequently controlled by the movement of the controller beck endforth. 26, 26 are carbon brushes which are couceve to fit perfectly the contour of the switch rod 24. 27, 27 are fiat springs held in position by retaining screws 28, 28 to hold the csrbon brushes 26, 26 yieldingly in position, hus iu suriug perfect electricsl contact,

I have illustrated five pairs of carbon brushes 26, but for as complete reversel only four are necesssr some motors which require five bein pructicelly obsolete at the present time, the contacts 25, clear that the motor cuu be re-= trolled by this switch, r lesible cable is provided to permit the mo erceut of the coutroller, so thotrio sliding coutects are uecessery. The door is iudicuted in broken sectiou at to which the breclret is secured iii any suitable wsy, some being indicated. suitable section (Duly one end sud one s me of this structure have been illustrateu, but the opposite end and side are symmetrical and would be lettered end sum bored the some, That is to say, at the opposite end of the travel of the door is s secou bracket or support 33 with adjustable stops. Whether the door is e. slidiugor swiugiug door is a matter of no consequence.

The operation of the structure is as follows: A switch as a push. button, is closed which starts e motor. As soon as the motor starts from the position indicated in the drawing, the right hand spring 17 reacts, moving the switch rod 15 to the central posltlon, closing the circuit independent or the push button and maintaining the circuit closed throughout the course of its travel or until the current is cutout. This admits the current through the appropriate brushes 26', 26 and contact 25 of the reversing switch, which is set to start the motor and carry the I BVelSln% 1!1lnlt with the door to the open pos1tion, en the unit reaches the 0 on position the left hand cut-out switch re 15 concally stop and that if the push button is held 7 down, owing to the feet that the motor is an induction motor, the motor will continue to run and the friction pulleys will slip on. the rope until the motor is stopped by opening the switch; then when the switch is closed the motor will reverse and close the door,

These operations are repeated indefinitely. Because there is e friction connection between the pulleys and the cable which is adjustable, the tension on the same can be such that if the door strikes an obstacle the frictiou pulleys "will slip and the action of the door-will not be so positive us to be dangercos.

I cleim:

1. In on electricelly opercted door orgate control, on electric motor, u connection. and

support therefor ou the said door or gate,

friction drive pulleys carried by said. support and gear-connection to the sold motor to drive one of the pulleys, a flexible traction v tid iug the some at the end of the travel of-suid door or gate, and e msuuelly controlled switch to start the action, as specified.

I 2. In a door actuating means, the combination of. a motor with suitable support on the said, door, stationary traction oonnec d tions disposed along the path of said motor,

gear connections from said motor to the said stationary connections, a cut-out switch carried by said support and operated by suitable-stops at the end of said door travel, a

reversing switch carried by said support with stops for actuating the same and reversing it at the end of said door travel to reverse the motor, and a manually conseid motor, as specified,

3. In an electrically operated door or gate control, an electric motor, a connection and trolled switch for initiating the action ofsupport therefor on the said door or gate,v friction drive means connected to said 1110- tor, a traction connection supported adjacent 1 the ath of said door eng edby the said friction drive, a cut-out swltch carried by the motor supportgstops for ,actuating the some at each end of the "travel of said door, a reversing switch carried by the said motor support with stops for shifting the same at door adapted to yield and permit the motor the end of travel of said door, and a control to run when the door in its travel is stopped switch to start the action, as specified. by obstruction or final stop, as specified. 10 4. In a door actuating means, the combina- Kalamazoo, Michigan, 801 Cobb Avenue, 5 tion of a motor with support on the said January 27th, 1926.

'- door, friction connections from said motor with coaeting means for actuating the said HERBERT CADY BLODGETT. 

